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Mechanical Properties of MaterialsDescribes the behavior of materials under application of force.Mechanical test all the variables affecting a given property is controlled.Strength of MaterialsThe greatest stress that a substance can bear under external forces without destruction.

Mechanical PropertyStress internally distributed forces which tend to resist deformation.

Strain deformation caused by the application of an external force.Mechanical PropertyStrength GradeAccording to the ultimate strength Brittle materials such as ordinary clay brick, stone, cement and concrete: grades are based on their compressive strengthPlastic materials and ductile materials such as steel: depend on their tensile strength

Specific StrengthMaterial strength divided by its apparent densityReduce structural weight and lower project costsMechanical PropertyElasticityRegaining original shape upon the removal of the external loadMechanical PropertyPlasticity

Describes the deformation of a material undergoing non-reversible changes of shape in response to external forces.

There are no pure plastic materials among building materials.

Mechanical PropertyUnder external forces, some materials will have elastic deformation and plastic deformation at the same time, but elastic deformation will disappear and plastic deformation still maintains when the stress Is removed, such as concrete.Mechanical PropertyProportional Limit & Elastic Limit

Maximum stress to which a material can be subjected without any deviation from the proportionality of stress and strain (Hookes Law) is called proportional limit.Maximum stress to which a material can be subjected without the occurrence of any permanent strain remaining upon complete release of the stress is called elastic limit.Mechanical PropertyStress Strain Relations in TensionMechanical Property

Mechanical Property

MalleabilityCan be severely deformed plastically in compression without fracture

DuctilityQuality of a material by virtue of which it may be plastically elongated.Mechanical PropertyBrittlenessProperty of a material that fractures when subjected to stress but has a little tendency to deform before rupture.Characteristics: little deformation, poor capacity to resist impact and vibration of load, high compressive strength, and low tensile strength.

ToughnessAlso called impact toughness. Impacted or vibrated by stress, a material is able to absorb much energy and deform greatly without rupture.Mechanical PropertyMechanical Property

Decorativeness of MaterialsThey play decorative, protective, and other specific roles (such as insulation, moisture-resistance, fireproofing, sound-absorption, and sound-insulation).Color

White or light-colored elevation hue = clean and fresh feeling;Dark-colored = dignified and stableRed, orange, yellow and other warm colors indoors = feels enthusiastic, excited and warm.Green, blue, violet = peaceful, elegant, cool.Different living conditions, climates, traditions, and customsDecorativeness of MaterialsTextureComprehensive impression given by the appearance of a material: roughness, unevenness, grain, patterns, and color differences.

LinetypeDecorative effect of the dividing joints and the convex lines ornamented on elevation.Decorativeness of MaterialsDurability of Materials- Materials are able to resist erosion from various media around and maintain their original properties.